The O-Ring, cataloged under National Stock Number 5331-01-237-3891, is classified within Federal Supply Class 5331 (O-ring) of the Hardware and Abrasives group. The manufacturer of record is Siemens Energy Inc. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | O-Ring |
| FSC / FSG | 5331 — O-ring (FSG 53) |
| Manufacturers | Siemens Energy Inc (CAGE 1LPE6); Marco Rubber & Plastics, Llc Dba Marco Rubber & Plastics (CAGE 58618) |
| Parameter | Value |
|---|---|
| NSN | 5331-01-237-3891 |
| Primary Part Number | 00-751-531-281 |
| Item Name | O-Ring |
| FSC / FSG | 5331 / 53 — O-ring |
| Manufacturer | Siemens Energy Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 00-751-531-281 PRIMARY | Siemens Energy Inc (USA) |
| B1000-454 | Marco Rubber & Plastics, Llc Dba Marco Rubber & Plastics (USA) |
| Reference | Meaning |
|---|---|
| 00-751-531-281 | 5/9 Secondary reference Siemen-Allis Inc |
| 00-751-531-281 | 3/9 Design control — primary reference Siemens Power Corp Fossil Div |
| CP-751-531-281 | 5/9 Secondary reference Siemens Power Corp Fossil Div |
NSN 5331-01-237-3891 is a O-Ring, manufactured by Siemens Energy Inc, classified under FSC 5331, O-ring. Status: active.
NSN 5331-01-237-3891 has 2 manufacturer part numbers on file: 00-751-531-281 (Siemens Energy Inc), B1000-454 (Marco Rubber & Plastics, Llc Dba Marco Rubber & Plastics).
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.